As we now know, extroverts are more sensitive to reward than introverts do. It’s what makes extroverts an extrovert. Richard Depue, a neurobiologist at Cornell University, conducted an experiment where he gave amphetamine, an addictive drug that activates the dopamine system#–the “reward chemical”, to groups of introverts and extroverts. His experiments shown that extroverts had stronger response and concluded that “introverts just don’t buzz as easily”. Although the exact relationship between extroversion, dopamine, and the brain’s reward system has not been conclusively established, “extrovert’s dopamine pathway appears to be more active than those of introverts,” wrote Cain.
